TS-TPC-7990 eMMC Backup/restore

Pick the latest image to restore to here:

• Debian (9) Stretch
• Ubuntu 16.04
• Yocto Morty
• FTP image directory for other images

The simplest way to backup/restore the eMMC is through u-boot. If you boot up with JP2 connected and stop in u-boot you can run this command:

ums 0 mmc 1

Now plug in the P1 USB port and this will make the board act as a USB mass storage device with direct access to the eMMC disk. On a linux workstation, to backup the image:

dmesg | tail -n 30
# Look for the last /dev/sd* device connected.  This should also match the eMMC
# size of around 3.78GiB.  On my system, this is /dev/sdd.
sudo mkdir /mnt/emmc/
sudo mount /dev/mmcblk1p1 /mnt/emmc/
cd /mnt/emmc/
sudo tar -cjf /path/to/ts-backup-image.tar.bz2 .
cd ../
sudo umount /mnt/emmc/
sync

To write a new filesystem:

dmesg | tail -n 30
# Look for the last /dev/sd* device connected.  This should also match the eMMC
# size of around 3.78GiB.  On my system, this is /dev/sdd.
sudo mkdir /mnt/emmc/
sudo mkfs.ext3 /dev/mmcblk1p1
# If the above command fails, use fdisk or gparted to repartition the emmc
# to have one large partition.
sudo mount /dev/mmcblk1p1 /mnt/emmc/
sudo tar -xjf /path/to/ts-new-image.tar.bz2 -C /mnt/emmc
sudo umount /mnt/emmc/
sync

Note that this interface is limited to about 1MB/s. You can write the eMMC disk faster by booting to SD with access to the image and using the native SD linux install to rewrite eMMC.